CN110666379A - Method for welding steel structure in high-altitude and high-cold area - Google Patents
Method for welding steel structure in high-altitude and high-cold area Download PDFInfo
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- CN110666379A CN110666379A CN201910903952.7A CN201910903952A CN110666379A CN 110666379 A CN110666379 A CN 110666379A CN 201910903952 A CN201910903952 A CN 201910903952A CN 110666379 A CN110666379 A CN 110666379A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the technical field of welding, aims to solve the problem that the welding quality cannot be ensured in a high-cold high-altitude area by a welding mode in the prior art, and provides a method for welding a steel structure in the high-altitude high-cold area, which comprises the following steps: preheating before welding; welding on site; the welding sequence of the beam-column joints on the same layer is that the beam-column joints symmetrically extend from the middle part to the periphery; welding a welding seam at one end of the same steel beam, and welding the other end of the same steel beam after the same steel beam is cooled; for each beam-column joint, welding a lower wing plate of a steel beam to the side surface of a steel column, and then welding an upper wing plate of the steel beam, wherein the welding directions of welding seams of the upper wing plate and the lower wing plate are opposite; postweld heat treatment; and immediately carrying out postweld heat treatment on the test piece by adopting an oxygen-acetylene flame baking gun after the welding is finished. The invention has the beneficial effects of adapting to high-cold and high-altitude areas and being capable of finishing high-quality steel structure welding seams.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a method for welding a steel structure in a high-altitude and high-cold area.
Background
The steel beam steel column frame structure adopts the vertical butt joint of steel column more, and the girder steel is connected between adjacent steel column, so has the beam column joint between girder steel and the steel column to and the vertical joint of steel column, these joint welds are one-level welding seam, and the welding quality requires highly. In high-altitude and high-cold areas, the welding construction process is influenced by high-cold climate, such as high altitude, thin air, low temperature, large wind power, large temperature difference change and the like, so that the welding difficulty is increased, the welding quality is not easy to ensure, and the increase of the repair workload has great influence on the whole construction period.
Disclosure of Invention
The invention aims to provide a method for welding a steel structure in a high-altitude and high-cold area, which is suitable for the high-altitude and high-cold area and can be used for completing high-quality welding seams of the steel structure.
The embodiment of the invention is realized by the following steps:
a method for welding a steel structure in a high-altitude and high-cold area comprises the following steps:
preheating before welding; arranging a steel pipe along the length direction of the welding seam, uniformly forming holes on one side of the steel pipe, introducing natural gas for combustion to uniformly heat the steel pipe so as to ensure that all parts of the welding seam are uniformly preheated;
welding on site; the welding sequence of the beam-column joints on the same layer is that the beam-column joints symmetrically extend from the middle part to the periphery; after the welding of the first layer is finished, welding the vertical joint of the steel column of the previous layer, and then welding the steel beam of the previous layer, wherein the welding sequence is also expanded from the middle part to the periphery symmetrically; for the welding of the beam-column joint, when the vertical deviation of the steel column exceeds 5mm, firstly welding a welding opening of the column in the inclined opposite direction; when the verticality deviation of the column is less than 5mm, simultaneously welding two symmetrical beams on two sides of the beam-column joint; welding a welding seam at one end of the same steel beam, and welding the other end of the same steel beam after the same steel beam is cooled; for each beam-column joint, welding a lower wing plate of a steel beam to the side surface of a steel column, and then welding an upper wing plate of the steel beam, wherein the welding directions of welding seams of the upper wing plate and the lower wing plate are opposite; for the welding of the steel column vertical joint, two workers weld at the same speed from opposite positions, and the same column joint is continuously welded; cutting off the upper and lower column connecting lug plates after welding 1/3 welding seams; welding seams are welded for four layers, the first time of welding is started from a position 50mm away from the column edge, the second time of welding is started from a position 50mm away from the first time, the third time of welding is started from a position 50mm away from the second time, and the like; the number of layers for welding the welding seams at two opposite sides for the first time is not more than 4, one welding seam is finished for 4 layers, and after the surfaces of the welding seams are cleaned, the welding seams at the other two opposite sides are welded by rotating 90 degrees; then 8 layers can be welded, and the other two opposite edges are changed, and the process is circulated until the welding seam of the whole column joint is fully welded;
after welding, polishing the welding seam and the range of the two sides of the welding seam;
postweld heat treatment; and immediately carrying out postweld heat treatment on the test piece by adopting an oxygen-acetylene flame baking gun after the welding is finished.
According to the scheme, through the processes of pre-welding, on-site welding and post-welding heat treatment, the pre-welding can uniformly preheat all parts of a welding seam, and the same-layer welding and the welding of the vertical steel column joint in the on-site welding both adopt a proper sequence and a proper method, so that the influence of expansion with heat and contraction with cold caused by temperature change in the welding process can be avoided to the maximum extent, and the welding quality of the beam column joint and the vertical steel column structure welded in the high-cold high-altitude area is ensured.
In this embodiment, for the situation when the thickness of the wing plate of the steel beam is greater than 30mm, the upper and lower flanges are welded in turn.
In this embodiment, the welding material is a low-hydrogen alkaline or titanium-calcium welding wire, and the welding groove is a small-angle V-groove to reduce the shrinkage. On the premise of ensuring the penetration of the welding, the groove is welded on the single side at a small angle and a narrow gap, so that the shrinkage can be reduced. When the plate thickness is larger than 30mm, the full penetration weld groove is required to be a double-sided groove, and the angle of the V-shaped groove is 35-45 degrees.
In this embodiment, before preheating before welding, preparation work before welding is performed; cleaning two sides of the groove, and polishing to be bright so that no corrosion and dirt exist around the groove.
In the embodiment, the preheating range of the pre-welding preheating comprises a range of at least 100mm from the center of the welding line to two sides, and the preheating temperature reaches a preset value within 100-200 ℃, and then the temperature is kept for 20-30 min by covering heat-preservation cotton.
In the embodiment, the postheat temperature of the postweld heat treatment is 250-300 ℃, and the constant temperature time is 1.5 hours; and covering a thick asbestos cloth after the post-heating temperature is reached, preserving the heat, sealing the air circulation part, and preserving the heat until the joint area, the surface of the welding line and the back reach the ambient temperature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.
FIG. 1 shows a sequence chart of welding of steel beams of the same layer (circled numbers in the figure indicate the sequence of welding);
FIG. 2 shows the welding sequence of the upper and lower wing panels at the same beam-column joint (circled numbers in the figure indicate the sequence of welding);
FIG. 3 illustrates a welding method of a steel column vertical joint (circled numbers in the figure indicate welding sequence);
the vertical connection mode and the V-shaped groove of the steel column are shown in FIG. 4.
Icon: 11-steel column, 12-steel beam, 13-upper wing plate, 14-lower wing plate, 15-V-shaped groove, 21-beam-column joint and 22-steel column vertical joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the terms are only used for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
The embodiment provides a method for welding a steel structure in a high-altitude and high-cold area, which comprises the following steps of:
preheating before welding; arranging a steel pipe along the length direction of the welding seam, uniformly forming holes on one side of the steel pipe, introducing natural gas for combustion to uniformly heat the steel pipe so as to ensure that all parts of the welding seam are uniformly preheated;
welding on site; referring to fig. 1, the welding sequence of the beam-column joint 21 on the same layer is that the joint symmetrically extends from the middle to the periphery; after the welding of the first layer is finished, welding the steel column vertical joint 22 of the previous layer, and then welding the steel beam 12 of the previous layer, wherein the welding sequence is also from the middle part to the periphery symmetrically; for the welding of the beam-column joint, when the vertical deviation of the steel column 11 exceeds 5mm, firstly welding a welding opening of the column in the inclined opposite direction; when the verticality deviation of the column is less than 5mm, simultaneously welding two symmetrical beams on two sides of the beam-column joint; welding a welding seam at one end of the same steel beam 12, and welding the other end of the same steel beam after the same steel beam is cooled; referring to fig. 2 in a matching manner, for each beam-column joint, the lower wing plate 14 of the steel beam 12 is welded to the side surface of the steel column 11, and then the upper wing plate 13 of the steel beam 12 is welded, and the welding directions of the welding seams of the upper wing plate 14 and the lower wing plate 14 are opposite; for the welding of the steel column vertical joint 22, two workers weld at the same speed from opposite positions, and the same column joint is continuously welded; cutting off the upper and lower column connecting lug plates after welding 1/3 welding seams; referring to fig. 3 in a matching manner, the vertical welding seams of the steel column 11 are welded in four layers, the first welding is carried out at a position 50mm away from the column edge, the second welding is carried out at a position 50mm away from the first welding, the third welding is carried out at a position 50mm away from the second welding, and the like; the number of layers for welding the welding seams at two opposite sides for the first time is not more than 4, one welding seam is finished for 4 layers, and after the surfaces of the welding seams are cleaned, the welding seams at the other two opposite sides are welded by rotating 90 degrees; then 8 layers can be welded, and the other two opposite edges are changed, and the process is circulated until the welding seam of the whole column joint is fully welded;
after welding, polishing the welding seam and the range of the two sides of the welding seam;
postweld heat treatment; and immediately carrying out postweld heat treatment on the test piece by adopting an oxygen-acetylene flame baking gun after the welding is finished.
According to the scheme, through the processes of pre-welding, on-site welding and post-welding heat treatment, the pre-welding preheating can uniformly preheat all parts of a welding seam, and the same-layer welding and the welding of the steel column vertical joint 22 in the on-site welding all adopt a proper sequence and a proper method, so that the influence of expansion with heat and contraction with cold caused by temperature change in the welding process can be avoided to the maximum extent, and the welding quality of the beam column joint and the steel column 11 vertical structure welded in the high-cold high-altitude area is ensured.
In this embodiment, for the situation when the thickness of the wing plate of the steel beam 12 is greater than 30mm, the upper and lower flanges are welded in turn.
In this embodiment, the welding material is a low-hydrogen alkaline or titanium-calcium welding wire, and the welding groove is a small-angle V-groove 15 to reduce the shrinkage. On the premise of ensuring the penetration of the welding, the groove is welded on the single side at a small angle and a narrow gap, so that the shrinkage can be reduced. When the plate thickness is larger than 30mm, the groove of the full penetration weld joint is required to be a double-sided groove, the angle of the V-shaped groove is 35-45 degrees, and the V-shaped groove 15 of the steel column vertical joint 22 is shown in FIG. 4.
In this embodiment, before preheating before welding, preparation work before welding is performed; cleaning two sides of the groove, and polishing to be bright so that no corrosion and dirt exist around the groove.
In the embodiment, the preheating range of the pre-welding preheating comprises a range of at least 100mm from the center of the welding line to two sides, and the preheating temperature reaches a preset value within 100-200 ℃, and then the temperature is kept for 20-30 min by covering heat-preservation cotton.
In the embodiment, the postheat temperature of the postweld heat treatment is 250-300 ℃, and the constant temperature time is 1.5 hours; and covering a thick asbestos cloth after the post-heating temperature is reached, preserving the heat, sealing the air circulation part, and preserving the heat until the joint area, the surface of the welding line and the back reach the ambient temperature.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for welding a steel structure in a high-altitude and high-cold area is characterized by comprising the following steps:
preheating before welding; arranging a steel pipe along the length direction of the welding seam, uniformly forming holes on one side of the steel pipe, introducing natural gas for combustion to uniformly heat the steel pipe so as to ensure that all parts of the welding seam are uniformly preheated;
welding on site; the welding sequence of the beam-column joints on the same layer is that the beam-column joints symmetrically extend from the middle part to the periphery; after the welding of the first layer is finished, welding the vertical joint of the steel column of the previous layer, and then welding the steel beam of the previous layer, wherein the welding sequence is also expanded from the middle part to the periphery symmetrically; for the welding of the beam-column joint, when the vertical deviation of the steel column exceeds 5mm, firstly welding a welding opening of the column in the inclined opposite direction; when the verticality deviation of the column is less than 5mm, simultaneously welding two symmetrical beams on two sides of the beam-column joint; welding a welding seam at one end of the same steel beam, and welding the other end of the same steel beam after the same steel beam is cooled; for each beam-column joint, welding a lower wing plate of a steel beam to the side surface of a steel column, and then welding an upper wing plate of the steel beam, wherein the welding directions of welding seams of the upper wing plate and the lower wing plate are opposite; for the welding of the steel column vertical joint, two workers weld at the same speed from opposite positions, and the same column joint is continuously welded; cutting off the upper and lower column connecting lug plates after welding 1/3 welding seams; welding seams are welded for four layers, the first time of welding is started from a position 50mm away from the column edge, the second time of welding is started from a position 50mm away from the first time, the third time of welding is started from a position 50mm away from the second time, and the like; the number of layers for welding the welding seams at two opposite sides for the first time is not more than 4, one welding seam is finished for 4 layers, and after the surfaces of the welding seams are cleaned, the welding seams at the other two opposite sides are welded by rotating 90 degrees; then 8 layers can be welded, and the other two opposite edges are changed, and the process is circulated until the welding seam of the whole column joint is fully welded;
after welding, polishing the welding seam and the range of the two sides of the welding seam;
postweld heat treatment; and immediately carrying out postweld heat treatment on the test piece by adopting an oxygen-acetylene flame baking gun after the welding is finished.
2. The method for welding the steel structure in the high-altitude and high-cold area according to claim 1, wherein:
and for the condition that the thickness of the wing plate of the steel beam is more than 30mm, welding the upper flange and the lower flange in turn.
3. The method for welding the steel structure in the high-altitude and high-cold area according to claim 1, wherein:
the welding material adopts low-hydrogen alkaline or titanium-calcium welding wires, and the welding groove adopts a small-angle V-shaped groove form so as to reduce the shrinkage.
4. The method for welding the steel structure in the high-altitude and high-cold area according to claim 1, wherein:
before preheating before welding, performing preparation work before welding; cleaning two sides of the groove, and polishing to be bright so that no corrosion and dirt exist around the groove.
5. The method for welding the steel structure in the high-altitude and high-cold area according to claim 1, wherein:
the preheating range of the pre-welding preheating comprises the range of at least 100mm from the center of the welding line to the two sides, and the constant temperature of the heat-preservation cotton is kept for 20-30 min after the preheating temperature reaches the preset value within 100-200 ℃.
6. The method for welding the steel structure in the high-altitude and high-cold area according to claim 1, wherein:
the postheating temperature of postweld heat treatment is 250-300 ℃, and the constant temperature time is 1.5 hours; and covering a thick asbestos cloth after the post-heating temperature is reached, preserving the heat, sealing the air circulation part, and preserving the heat until the joint area, the surface of the welding line and the back reach the ambient temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910903952.7A CN110666379A (en) | 2019-09-24 | 2019-09-24 | Method for welding steel structure in high-altitude and high-cold area |
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| CN201910903952.7A CN110666379A (en) | 2019-09-24 | 2019-09-24 | Method for welding steel structure in high-altitude and high-cold area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112008208A (en) * | 2020-09-02 | 2020-12-01 | 中国电建集团山东电力建设第一工程有限公司 | Method for controlling welding temperature of steel structure in alpine region |
| CN112372166A (en) * | 2020-11-03 | 2021-02-19 | 广州江河幕墙系统工程有限公司 | Welding process capable of controlling deformation of spatial structure node |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112008208A (en) * | 2020-09-02 | 2020-12-01 | 中国电建集团山东电力建设第一工程有限公司 | Method for controlling welding temperature of steel structure in alpine region |
| CN112372166A (en) * | 2020-11-03 | 2021-02-19 | 广州江河幕墙系统工程有限公司 | Welding process capable of controlling deformation of spatial structure node |
| CN112372166B (en) * | 2020-11-03 | 2022-06-14 | 广州江河幕墙系统工程有限公司 | Welding process capable of controlling deformation of spatial structure node |
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